depends if you want the same message on all of your sites! Me: sometimes yes, sometimes no.

I am learning that as I go on. I don't quite see a difference between the two yet, but I might as I get better with Plurk.

it's good for posting to Twitter/Plurk/Facebook/Tumblr etc. when at work (all of those are blocked)

have to sign in from home to actually participate in conversations, though

That is a great idea! Everything but Twitter is blocked at school.